Polyurethane chute liners outperform rubber in zones where fine ore particles slide across the liner surface at shallow angles. The dense, cross-linked PU polymer structure provides excellent resistance to fine-particle grinding abrasion — the dominant wear mechanism at chute floors, discharge lips, and angled sidewalls. PU typically lasts 2-3× longer than rubber in these sliding abrasion zones.
| Parameter | Specification |
|---|---|
| Base polymer | MDI-based polyurethane (cast) |
| Hardness range | 65-95 Shore A (application specific) |
| Tensile strength | 35-45 MPa (varies by hardness) |
| Elongation at break | 350-450% |
| Abrasion loss (DIN 53516) | 25-30 mm³ (much better than rubber 250 mm³) |
| Standard thickness | 15, 20, 25, 30, 40, 50mm |
| Maximum panel size | 1,500 × 1,000mm (larger on request) |
| Fixing method | Adhesive bonding; bolt-on with backing plate; stud insert |
| Temperature range | -20°C to +70°C continuous |
| Chemical resistance | Good — dilute acids and alkalis |
| Colour options | Yellow (standard), red, black, custom |
| Condition | PU Wins | Rubber Wins |
|---|---|---|
| Impact angle | <45° (sliding) | >60° (high impact) |
| Material size | Fine ore <50mm | Large lump >100mm |
| Moisture | Wet or dry | Dry impact zones |
| Temperature | Up to 70°C | Up to 80°C (NR) |
| Chemical exposure | Dilute acid/alkali | Not recommended for acids |
Most engineered transfer chutes use both rubber and PU in the same chute — rubber (NR 45A, 60mm) at the impact zone top, transitioning to PU (80A, 25mm) at the sliding ore flow zone bottom. This hybrid approach delivers 40-60% longer overall liner life vs single-material lining. We design hybrid liner packages — send your chute drawing for a free zone-by-zone recommendation.
Send us your conveyor dimensions, material type, and capacity. We will provide a detailed specification and competitive price within 24 hours.
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